PONTOON RENTAL BUSINESS
The area you're interested in focusing on -- are there a lot of resorts around? Because otherwise, I don't see where the demand would be coming from. Its not as if people are sitting at home, thinking "man, I wish I could go fishing right now, if only I had a boat." Those people already have boats. And if you are focusing on resorts, the resorts are probably going to want a cut.
And I think most of your business would be pleasure-boaters, not fishermen. Because if you are focusing on resorts, etc, if they wanted to fish, you'd be looking at supplying them with gear and bait as well, its not like they'd have that in their suitcases....
The size of lakes might hurt you. I think you will want bigger lakes with more going on like restaurants,bars and things like that. I am not sure people would rent a pontoon to fish such a small lake.